I'm such a monster!

I was just clipping Missy and Peanuts long nails with the new clippers I bought, when Missy flung out her back leg, and I ended up clipping that nail way to low.  Now the poor thing is bleeding terribly (or at least it looks like it to me)  I tried a styptic stick, but that didn't work. So then I held pressure on it.  That worked somewhat.  I have put her back in her cage, and hopefully it will slow right down and stop shortly.  Had to change my shirt which was covered in blood, then rinse the towel out, which was soaked in blood.  I wonder how much blood they have.  I hope she stops soon.  I don't want to be a murderer!